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2 Types of skin Cancer Basal cell carcinoma (BCC) most common (3-4 times more common than SCC; of 69,000* NMSCs in Canada in 2007, 52,000-55,000 are likely BCC and remainder SCC)) rarely metastasizes or causes death ~ 2:1 male to female ratio Squamous cell carcinoma (SCC) less common than BCC but common can metastasize/cause death but not commonly (220/yr*) ~ 2:1 male to female ratio Melanoma least common (4,600/yr *) most common skin cancer cause of death (900/yr *) 5 yr relative survival 89% * ~ 1:1 male to female ratio * also occurs in eye and, rarely, other tissues * Source: Canadian Cancer Statistics 2007

3 Skin cancer quick facts: Stats 1 Skin cancer (including basal and squamous cell carcinomas collectively referred to as nonmelanoma skin cancer (NMSC) and melanoma) is the most common cancer, by far, in Canada: In 2007, 73,600* Canadians diagnosed with skin cancer (Canadian Cancer Statistics (CCS) 2007) 1 in 7 Canadians will develop some form of skin cancer during their lifetime Skin cancers represent 1/3 of all new cases of cancer each year [see separate slide] (CCS2007) Because survival is excellent for those diagnosed with NMSC and good for melanoma, skin cancer is also the most prevalent form of cancer* Many with skin cancer develop recurrences and/or second primary skin cancers Deaths due to NMSC are rare about 220 in 2007 (CCS2007) - but are more common for melanoma in 2007 (CCS2007) * Comprehensive statistics on NMSC are not available because the majority of cancer registries do not try to capture (because they are so frequent and so often diagnosed and/or treated in facilities requiring special data collection efforts). Incidence stats are based on 3 Canadian registries that have some data BC, MN and NB)

4 Most common cancers, Canada, 2007* Skin Lung Breast 73,600 Canadians will be diagnosed with skin cancer in /3 of all new cancers Prostate 4,600 are melanoma Colorectum Non-Hodgkin Lymphoma Estimated number of new cases, Canada, 2007 Source: Canadian Cancer Statistics 2007 > 1 in 7 will develop skin cancer during their lifetimes Skin cancer rare in Asians, blacks, Aboriginals

5 Skin cancer quick facts: Stats 2 Melanoma (CMM) is the second most common cancer in young adults (ages 15-34) BCC is also common in this age group. Incidence rates of melanoma are increasing, including in young adults 2.0% per year in incidence rates for males and 1.1% for females between 1994 and 2003 (CCS2007) In Ontario s young adults, incidence was or stable in the late 1980s/early 1990s; now Melanoma mortality rates increasing until recently; may now have stabilized NMSC incidence also increasing although limited data available* (Hayes et al. 2007, New Brunswick; Demers et al. 2005, Manitoba) * Comprehensive statistics on NMSC are not available because the majority of cancer registries do not try to capture (because they are so frequent and so often diagnosed and/or treated in facilities requiring special data collection efforts). Incidence stats are based on 3 Canadian registries that have some data BC, MB and NB)

6 Melanoma is common in young adults >8,000 new diagnoses of melanoma in year olds in Canada in the 1990s Ranks second after breast cancer Breast (21%) Melanoma (N=8123, 8%) Thyroid (7%) Cervix (6%) NHL (6%) % distribution of incident cancers, ages 20-44, , Canada Source: Cancer Care Ontario: Cancer in Young Adults in Canada (2006)

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8 Skin cancer quick facts: Causes 1 Over-exposure to UVR major cause in Canada (Armstrong BK, Kricker A, 1993) UVR is a known carcinogen [see separate slide] Over-exposure early in life (childhood and adolescence) particularly increases risk of melanoma (Armstrong BK 1997) and possibly BCC [see separate slide] UVB (short wavelength) appears to be most important for SCC; UVA may be relatively more important for melanoma Most important aspect of sun exposure varies lifetime cumulative exposure is most important for SCC and for some types of melanoma, especially those that develop later in life intermittent exposure* is most important for melanoma, especially for those developing earlier BCC is probably somewhere in between NOTE: total dose is also important for melanoma and BCC * Intermittent exposure is characterized by relatively short, intense exposure episodes, the type that is more likely to result in sunburn. Thus, sunburn is considered to be one indicator of this type of exposure. It is not clear whether sunburn has an independent effect on skin cancer risk.

9 Ultraviolet radiation (UVR) is carcinogenic Solar radiation is a human carcinogen causing all forms of skin cancer UVA and UVB are carcinogenic in animals and probably in humans (Source: International Agency for Research on Cancer, 1992) Solar radiation is known to be a human carcinogen Broad-spectrum UVR is known to be a human carcinogen UVA and UVB are reasonably anticipated to be a human carcinogen Exposure to sunlamps or sunbeds is known to be a human carcinogen (Source: National Toxicology Program, Report on Carcinogens, 2005)

10 Evidence that intense sun exposure in youth may be especially harmful Melanoma occurs at relatively young ages Young age at migration to Australia increases risk Most nevi (moles) arise prior to age 20 nevi are related to sun exposure many nevi increases the risk of melanoma Melanoma body site distribution in young adults favours sites not usually exposed (trunk & limbs vs. head & neck) Some epidemiologic studies show stronger associations with early age at exposure - not consistent or convincing

11 Skin cancer quick facts: Causes 2 Tanning equipment is an important source of UVR, both UVA and UVB Doses delivered by tanning equipment are often very high Youth and young adults are the main users of tanning equipment Availability of tanning equipment is increasing Use of TE increases the risk of skin cancer UVR is also a potential workplace hazard (mostly for outdoor workers, who may have very large but not usually intermittent doses, but also welders, and others who work with specialized lights that emit UVR)

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